Re: [CAD_CAM_EDM_DRO] Stepper Voltage and Current question

Hi,

If the motors are 3 volts and 2 amps, that means the windings are 1.5 ohms.
If you apply 25 volts to these coils you'll draw almost 17 amps which will
shut down your supply, toast your driver circuit, etc.

To limit current, say at 25 volts, you'd need a approx. an 11 ohm power
resistor that could handle 110 watts. That would be nuts. You better have a
chopper drive and even then I'd go to a higher voltage motor with that
supply.

bob

>From: "starcast82" <rh@...>
>Reply-To: CAD_CAM_EDM_DRO@yahoogroups.com
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: [CAD_CAM_EDM_DRO] Stepper Voltage and Current question
>Date: Fri, 03 May 2002 05:10:07 -0000
>
>I am currently starting to design my stepper drive and wanted to make
>sure of a couple things. I hate to see smoke. First off I have 3
>volt, 2 amp unipolar stepper motors.
>
>1. I plan on using 25 volt supply, is this enough or should I jump up
>to 50 volts ? I read I can go 20 times the rated voltage.
>
>2. As far as current limiting goes, since I have 2 amp motors, from
>what little I found from reading, does this mean I can run 2 amps
>through each of the 4 coils <what I read> or does this mean I can
>run .5 amp through each coil ?
>
>Thanks for the help
>If anyone is interested in what I come up with when I'm finished I'll
>be more than happy to post it.
>
>
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